Project description

I2C eeprom device drivers (pure Python)

I2C flash devices, also known as DataFlash are commonly found in embedded
products, to store firmware, microcode or configuration parameters.

PyI2CFlash comes with several pure Python drivers for those flash devices, that
demonstrate use of I2C devices with PyFtdi. It could also be useful to dump
flash contents or recover from a bricked devices.

Notes about performances

Read operation is synchronous with I2C bus clock: it therefore only depends
on the achievable frequency on the I2C bus, which is bound to the highest
supported frequency of the flash device.

Write operation depends mostly on the flash device performance, whose upper
limit comes mostly from the maximum write packet size of the device, as the
device needs to be polled for completion after each packet: the shorter the
packet, the higher traffic on the I2C and associated overhead.

Notes about 24AA32

This device is declared obsolete by the manufacturer and is not supported.

Only 24AA32A revision is supported.

Supported I2C flash commands

Read

Read byte sequences of any size, starting at any location from the I2C
flash device

Write

Write arbitrary byte sequences of any size, starting at any location to the
I2C flash device